Heath Zenith Chime Extender

This doorbell extender works by listening for your existing doorbell to ring. When it does, the transmitter sends a wireless radio signal up to 100 feet to the plug-in door chime receiver. The unit is simple to install. Simply place the extender's transmitter on top of your existing chime and then plug the receiver into a standard wall outlet. The extender module uses 4 "AA" batteries (sold sepetately) and measures 1.97 inchW x .63 inchD x 5.94 inchH. The White plug-in chime features three selectable sounds with adjustable volume and measures 3.48 inchW x 1.42 inchD x 12 inchH.